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The '''Soviet Union''' (Russian: Советский Союз, ''Sovyetskiy Soyuz''), formally the '''Union of Soviet Socialist Republics''' (or '''USSR''') (Russian: Союз Советских Социалистических Республик, ''Soyuz Sovietskykh Sotsialisticheskykh Respublik'', abbreviated ''СССР'') existed 1917-1991, then broke into 15 separate countries, most notably [[Russia]]. It was the most powerful established [[socialist]] states in history, coming to power under [[Lenin]] in 1918 and killing millions of its peasants to establish a ruthless Communist dictatorship under [[Joseph Stalin]] in the 1930s. After cooperating with the USSR (1939-41), the Nazi Germans under [[Adolph Adolf Hitler]] invaded in a war to the death. The USSR defeated the Nazis in [[World War II]] (1941-45), and took control of most of Eastern Europe, turning formerly independent countries into Communist satellites. It was the primary antagonist of the United States during the [[Cold War]] (1947-1989), then collapsed because of American pressure and its own internal economic and social failures. At its height the USSR covered one-sixth of the earth's land area stretching from eastern Europe across north Asia to the Pacific Ocean.